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Entry  Fri Jan 22 11:33:20 2016, gautam, Update, Green Locking, AUX-X AM/PM investigations AUX_X_AM.pdfAUX_X_RIN.pdfNE_Mephisto.png
    Reply  Fri Jan 22 13:33:37 2016, ericq, Update, Green Locking, AUX-X AM/PM investigations 
       Reply  Fri Jan 22 17:22:06 2016, gautam, Update, Green Locking, AUX-X AM/PM investigations AM_response.pdfNE_investigations.pdf
          Reply  Fri Jan 22 18:46:03 2016, rana, Update, Green Locking, AUX-X AM/PM investigations 
Message ID: 11946     Entry time: Fri Jan 22 17:22:06 2016     In reply to: 11945     Reply to this: 11947
Author: gautam 
Type: Update 
Category: Green Locking 
Subject: AUX-X AM/PM investigations 

There were a number of directories in /users/OLD/mott/PZT/2NPRO, I've used the data in Innolight_AM_New. Also, I am unsure as to what their "calibration" factor is to convert the measured data into RIN, so I've just used a value of 0.8, with which I got the plot to match up as close as possible to the plot in this elog. I also redid the measurement today, given that the laser parameters have changed. The main difference was that I used an excitation amplitude of +15dBm, and an "IF Bandwidth" of 30Hz in the parameter files for making these measurements, which I chose to match the parameters Mott used. There does seem to be a shift in some of the features, but the <100kHz area seems similar to the old measurement now. 

Having put the PD back in, I also took measurements of the RIN with the input to the laser PZT terminated. There is no difference with the Noise Eater On or OFF! 

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Attachment #1 shows the measured AM response. It differs qualitatively in shape from the earlier measurements reported in this elog and on the wiki below the 100kHz region. 

It looks like some of the features may have shifted in frequency. The previous measurement results can be found in /users/OLD/mott/PZT/2NPRO, can you plot the two AM measurements together?

 

Attachment 1: AM_response.pdf  88 kB  | Hide | Hide all
AM_response.pdf
Attachment 2: NE_investigations.pdf  55 kB  | Hide | Hide all
NE_investigations.pdf
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